JPH0332478A - Method and device for joining band-like metallic plate - Google Patents

Abstract

PURPOSE:To improve the strength of a weld zone by executing ultrasonic welding in a state that a superposed part of band-like metallic plates exceeds a prescribed temperature. CONSTITUTION:By superposing each end part of band-like metallic plates 10, 12, and pressing its superposed part 15 by a vibration body consisting of an ultrasonic vibrator 16 and a tool 18, ultrasonic welding is executed. In this case, in a state that the superposed part 15 of the band-like metallic plates 10, 12 exceeds a prescribed temperature, ultrasonic welding is executed. The superposed part 15 is heated by a heating means consisting of a heater 36. In such a way, ultrasonic welding can be executed in a short time.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method and a joining device for band-shaped metal plates, and in particular to a method and a device for joining band-shaped metal plates, and in particular to a method and a device for joining band-shaped metal plates, in which the overlapping portions of the band-shaped metal plates are ultrasonically welded. The present invention relates to a joining method and a joining device.

[Conventional technology]

Traditionally, as a method for joining strip-shaped metal plates, an ultrasonic vibrator is moved along the contact surfaces while applying vertical pressure to the mutually contacting surfaces (overlapping surfaces) of the objects to be welded (strip-shaped metal plates). There is an ultrasonic welding method that involves welding.

FIG. 5 shows the main structure of this type of ultrasonic welding section. The ends of the band-shaped metal plates 10 and 12 are placed on a support stand (
They are superimposed and fixed on an anvil (anvil) 14, and the superimposed surfaces are pressed by a disc-shaped tool 18 connected to an ultrasonic transducer 16.

By moving the overlapping surfaces in the width direction while the tool 18 rotates, the linear locus portion of the tool 18 is welded to the overlapping surfaces (as described in Japanese Patent Laid-Open No. 59-24526).

On the other hand, in ultrasonic welding, the energy required for welding differs depending on the material and thickness of the metal plate, so the amplitude of ultrasonic vibration, pressure, and moving speed of the tool are adjusted appropriately depending on the metal plate to be welded. Is going.

[Problem to be solved by the invention]

However, the increase in energy is limited by the mechanical and electrical capabilities of the ultrasonic welding equipment, so in the case of metal plates with poor welding properties, there is a method of welding by slowing down the moving speed of the tool, but this method has the disadvantage that it takes a long time to bond.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method and device for joining belt-shaped metal plates that can be ultrasonically welded in a short time even if the metal plates have poor joining properties. .

[Means to solve problems]

In order to achieve the above-mentioned object, the present invention provides a method for temporarily joining band-shaped metal plates by overlapping the ends of the band-shaped metal plates, pressing the overlapped parts with an ultrasonic vibrator, and ultrasonically welding them. There,
It is characterized in that the overlapping portions of the gold strips *Ii are ultrasonically welded at a predetermined temperature or higher.

[Effect]

According to the invention, the heating means (36)
5) is heated to a predetermined temperature, and the overlapping surface (
15> is ultrasonically welded, the strength of the welded part can be improved.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the method and apparatus for joining band-shaped metal plates according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram of a method for joining band-shaped metal plates according to the present invention, and members that are the same or similar to those in the conventional example shown in FIG. 5 will be described with the same reference numerals.

At the first proboscis, the band-shaped metal VjLlo is unwound from the roll 20, rolled onto a bus roller 22, and conveyed to the joining device 24. 117 Bricut device 2 of joining device 24
6 consists of a cutter 28.28. The tip portion 10A of the band-shaped metal plate 10 is cut so that it can be overlapped with the rear end portion 12A of the band-shaped metal plate 12 to be joined by the bricutting device 26. In addition, the belt-shaped metal plate lO to be rewound
If the leading end 10A of the metal strip 12 can be directly overlapped with the rear end 12A of the band-shaped metal plate 12, the bricutting device 26 is not used.

An ultrasonic welding device 30 is provided after the bricutting device 26.
is provided, and this welding device 30 includes clamps 32, 34,
It is composed of an anvil 141 and an ultrasonic transducer 16 shown in FIG. The clamp 32 holds the tip 10A of the band-shaped metal plate lO, and the clamp 34 holds the band-shaped metal plate 12.
The rear end portion 12A of is held. At this time, the tip! OA,
The rear end portion 12A is overlapped and fixed on the anvil 14.

The anvil 14 has a prismatic shape as shown in FIG. 2, and has a built-in heater 36 electrically connected to a temperature control device (not shown). The heater 36 is embedded along the longitudinal direction of the anvil 14, as shown in FIG.

Further, a temperature sensor 38 is fixed to the side surface of the anvil 14, and the temperature sensor 38 is electrically connected to the temperature control device. This temperature control device controls the heat generation temperature of the heater 36 based on temperature information detected by the temperature sensor 38. That is, in this embodiment, the i degree of the anvil 14 is controlled to be within the range of 50°C to 200°C.

As shown in FIG.
Direction of arrow in the figure> It is provided movably and movably in the vertical direction. A disk-shaped tool 18 is rotatably attached to the tip of the ultrasonic vibrator 16, and the ultrasonic vibrator 1
When the tool 6 moves downward, the peripheral edge of the tool 18 presses the overlapping surface 15 with a predetermined pressure.

Therefore, when the ultrasonic vibrator 16 transmits ultrasonic vibration to the tool 18 and moves along the overlapping surface 15, the tool 18 comes into contact with the overlapping surface 15, so that the overlapping surface 15 Ultrasonic welding is carried out in a straight line with a rolling contact.

Next, a method for joining metal strips using the device for joining metal strips constructed as described above will be described.

First, the heater 36 is heated, and the temperature sensor 3 detects that the temperature of the anvil 14 has risen to the desired temperature (50°C to 200°C).
8 is detected, a signal is transmitted from the temperature control device to the heater 36 to adjust the heat generation temperature of the heater 36 to maintain the anvil 14 at a desired temperature. Next, the front end 10A of the band-shaped metal plate 10 and the rear end 12A of the band-shaped metal plate 12 are placed on the anvil 14 in an overlapping manner, and fixed with the clamps 32 and 34 of the welding device 30. As a result, the overlapping surface 15 of the band-shaped metal plates 10.12 is heated by heat conduction from the anvil 14, and rises to approximately the same temperature as the anvil 14. Next, on the heated overlapping surface 15,
The ultrasonic vibration is transmitted from the ultrasonic vibrator 16 through the tool 18, and the ultrasonic vibrator 16 is moved downward and the overlapping surface 15 is pressed with the tool 18, and then the ultrasonic vibrator 16 is The tool 18 is moved along the overlapping surface 15 by moving in the six directions of arrows in FIG.

As a result, the overlapping surfaces 15 are ultrasonically welded in a heated state, so the joining ability is improved, and even with metal plates with poor joining properties, the amplitude and pressure of ultrasonic vibrations do not increase, and the welding can be performed in a short time. Can be welded.

Next, the results of comparing the peel strength of the bonded portion with respect to the anvil temperature will be explained with reference to FIG.

The test sample used was a band-shaped metal plate made of aluminum (equivalent to H36) and having a plate thickness of 0.3 a+m and having relatively poor bondability. Further, the output of the ultrasonic welding device 30 is 2°4 KW, the frequency is 1.9 KHz, and the pressure of the tool 18 is 80 kg.
The test was conducted with the moving speed of the ultrasonic transducer 16 set at 1.3 m/min. The results are shown in FIG. .

According to the fourth (!l), when the temperature of the anvil 14 is set to the lower limit temperature of 50°C, the peel strength increases to 1.0 kg/beat, and when it is further set to the upper limit temperature of 200°C. It was found that the peel strength was 2.gkg/u, which is higher than that of conventional bonding methods.

It has also been found that the temperature of the overlapping surface 15 of the band-shaped metal plates is distributed within a range of ±5° relative to the temperature of the anvil 14, and that uniform peel strength can be obtained within this range.

In this embodiment, the anvil 14 is heated to raise the temperature of the overlapping surface 15, but a heater is provided in the welding device t30 to heat the atmosphere near the overlapping surface 15, thereby increasing the temperature of the overlapping surface 15. 15 may be raised to the desired temperature.

[Effects of the Invention As explained above, according to the method and device for joining band-shaped metal plates according to the present invention, ultrasonic welding is performed after the overlapping surfaces are heated to a predetermined temperature by the heating means. This makes it possible to improve the strength of the welded part. Therefore, even metal plates with poor welding properties can be ultrasonically welded in a short time without increasing the energy required for welding.

[Brief explanation of drawings]

FIG. 1 is a process diagram showing an embodiment of a joining device to which the ultrasonic welding device for band-shaped metal plates according to the present invention is applied, and FIG. 2 is a perspective view showing an embodiment of the ultrasonic welding device according to the present invention. FIG. 3 is a cross-sectional perspective view showing an embodiment of the support base applied to the ultrasonic welding apparatus according to the present invention, FIG. 4 is an explanatory diagram showing test results of peel strength with respect to anvil (support base) temperature, and FIG. The figure is a perspective view showing an example of a conventional ultrasonic welding device. 10.12... Band-shaped metal plate, 14... Anvil (support stand), 16... Ultrasonic transducer, 18...
Tool, 36... Heater, 38... Temperature sensor.

Claims (2)

[Claims] (1) In a method for joining band-shaped metal plates in which the ends of the band-shaped metal plates are overlapped and the overlapped portions are pressed by an ultrasonic vibrator and ultrasonically welded, the overlapped portion of the band-shaped metal plates is A method for joining band-shaped metal plates, characterized by ultrasonic welding at a temperature above a predetermined temperature. (2) In a band-shaped metal plate joining device that overlaps the end portions of band-shaped metal plates and ultrasonically welds the overlapped portions using an ultrasonic vibrator, a heating means is provided to heat the overlapped portions. A joining device for band-shaped metal plates, which is characterized by: